Download Chapter 35 Drugs Used to Treat Constipation and Diarrhea

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Chapter 35
Drugs Used to Treat Constipation and Diarrhea
Learning Objectives
State the underlying causes of constipation
Explain the meaning of “normal” bowel habits
Cite nine causes of diarrhea
Describe medical conditions in which laxatives should not be used
Learning Objectives (cont’d)
Identify electrolytes that should be monitored whenever prolonged or severe diarrhea is
present
Describe nursing assessments needed to evaluate the patient’s state of hydration when
suffering from either constipation or dehydration
Constipation
Infrequent, incomplete or painful elimination of feces
“Normal” bowel habits vary
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Daily bowel movement not necessary
As long as patient’s health is good and stool not hardened or impacted, this is
acceptable
Constipation (cont’d)
Causes
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Improper diet
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Too little fluid intake
Lack of exercise—sedentary habits
Failure to respond to normal defecation impulses
Muscular weakness of the colon
Diseases such as anemia and hypothyroidism
Frequent use of constipating medicines
Tumors of the bowel or pressure from tumors
Diseases of the rectum
Diarrhea
An increase in the frequency of fluid content of bowel movements
Diarrhea (cont’d)
Causes
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Intestinal infections
Spicy or fatty foods
Enzyme deficiencies
Excessive use of laxatives
Drug therapy
Emotional stress
Hyperthyroidism
Inflammatory bowel disease
Surgical bypass of the intestine
Treatment of Altered Elimination
Constipation
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High-fiber diet, adequate hydration, exercise
Use of laxatives should be avoided
Treatment of Altered Elimination (cont’d)
Diarrhea: treatment depends on specific cause of diarrhea, which may be:
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Chronic, mild or severe
Indication of disease of stomach, small or large intestine
Psychogenic
Symptom of cancer of the colon or rectum
Treatment of Altered Elimination (cont’d)
Nursing process
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Assessment: obtain history, medications, activity and exercise, elimination patterns,
nutritional history, basic assessment, vital signs; review lab reports
Monitor electrolytes in prolonged diarrhea
Monitor hydration
Learning Objectives
Identify the indications for use, method of action, and onset of action for stimulant
laxatives, saline laxatives, lubricant or emollient laxatives, bulk-forming laxatives, and fecal
softeners
State the differences between locally acting and systemically acting antidiarrheal agents
Learning Objectives (cont’d)
Cite conditions that generally respond favorably to antidiarrheal agents
Review medications studied to date and prepare a list of those that may cause diarrhea
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Laxatives
Stimulant laxatives
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Saline laxatives
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Hypertonic compounds draw water into the intestines from surrounding tissues,
distending bowel and causing peristalsis
Laxatives (cont’d)
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Fecal softeners: draw water into bowel to soften stools; do not cause peristalsis
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Used routinely for prophylactic purposes
Bulk-forming laxatives
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Drug of choice for those who use laxatives routinely; they absorb irritating
substances and soften stools
Table 35-1 pg 565
Laxatives (cont’d)
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Used to relieve acute constipation and routine elimination of gas and feces before
radiologic examination of kidneys, colon, intestine, or gallbladder
Laxatives (cont’d)
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Act directly on intestines; promote peristalsis and evacuation
Lubricant laxatives
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Lubricate intestinal wall, allowing for smooth passage of fecal contents
Used as prophylactic for patients who should not strain during defecation
Laxatives (cont’d)
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Antidiarrheal Agents
Locally acting agents
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Absorb excess water to cause a formed stool and absorb irritants or bacteria
causing diarrhea
Systemic agents
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Act through autonomic nervous system to reduce peristalsis and motility of the GI
tract, allowing the mucosal lining to absorb nutrients, water, and electrolytes,
leaving a formed stool
Antidiarrheal Agents (cont’d)
Help control inflammatory bowel disease
Postgastrointestinal surgery patients may require agents to help absorb electrolytes and
fluids
Many cases are self-limiting but may be prescribed by health care professionals
Antidiarrheal Agents (cont’d)
Medications That May Cause Diarrhea
Antibiotics
Antacids containing magnesium